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A History Lesson from Genes: Using DNA to Tell Us How Populations Change

When Charles Darwin first sketched how species evolved by natural selection, he drew what looked like a tree. The diagram started at a central point with a common ancestor, then the lines spread apart as organisms evolved and separated into distinct species.

In the 175 years since, scientists have come to agree that Darwin’s original drawing is a bit simplistic, given that multiple species mix and interbreed in ways he didn’t consider possible (though you can’t fault the guy for not getting the most important scientific theory of all time exactly right the first time). Using a tree-like structure is a great way to show the history of the evolution of a species, or its phylogeny. But it’s not so great for showing the population history of groups within a single species, such as humans, who can move around and interbreed with each other.

David Connolly's insight:

If you try to make a tree of population histories within a species, there’s always the possibility that you’ve got genes flowing from one branch to another,

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The real 'Google pyramids' revealed

The real 'Google pyramids' revealed | Archaeology News | Scoop.it

The place that went viral last month as the potential site of a mysterious Egyptian pyramid looks more like a series of mounds on the surface of Mars when you see it up close.

The site has been familiar to Egyptologists since the 1920s: It's thought to have been the locale for a desert settlement going back to Egypt's Ptolemaic era, when Greek and Roman influences were on the ascendance. Did these mounds serve as watchtowers, or tombs, or well sites? That's what the Soknopaiou Nesos Project wants to find out.

Egyptologist Paola Davoli of Italy's University of Salento in Leccefrom the project has also been in touch with Angela Micol, the North Carolina researcher who turned the spotlight on Dimai last month via her Google Earth Anomalies website.

 

Based on the satellite imagery, Micol imained that the mounds represented eroded pyramids. The up-close pictures make the formations look more like piles of rocky rubble. The largest one appears to have the ruins of a square building or walls on its summit, but it'll take a full-blown excavation to fully date the site.

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'Google Earth pyramids' revisited

'Google Earth pyramids' revisited | Archaeology News | Scoop.it

Remember that researcher who thought she spotted previously undiscovered Egyptian pyramids in Google Earth imagery? It turns out that there really are some ruins in the picture, but they’re not pyramids.

Well that settles this earth mystery.

What is needed is the ability to see what is already known. This can come from a lack of knowledge about how to find the information but also from a lack of collation or publishing of the information in the first place. Both as bad.

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